The annual rate of diagnosis with HIV, the virus that causes AIDS, fell by a third in the United States between 2002 and 2011, researchers reported on Saturday. Fewer people in all U.S. groups tested positive for human immunodeficiency virus except for gay and bisexual men ages 13 to 24 and over 45, they wrote in a special issue of the Journal of the American Medical Association. "Among men who have sex with men, unprotected risk behaviors in the presence of high prevalence and unsuppressed viral load may continue to drive HIV transmission," the report said. The United Nations said on Wednesday that there were 2.1 million new HIV infections worldwide in 2013, down 38 percent from 2001.
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